Percussion pump



July 29, 1924. 1,502,984 R. ESNAULT-PELTERIE PERCUSSI 0N PUMF Filed Oct.22, 1923 Y 5 Sheets-Sheet 2 ROBERT ESNAULT-PELTERIB mvsm'ron ru m cATTORNEYQ.

Jufiy 29, 1924. 1,502,984

' R. ESNAULT-PELTERIE PERCUSS ION PUMP Filed Oct. 22 1923 5 Sheets-Sheet3 5 m Ill 7 Roman": Emma-Panama,

INVENTOQ- July 29, 1924. r 1,502,984

R. ESNAULT-PELTERIE PERCUSS ION PUML Filed Oct-22', 1923 5 sheets-sheet4 Ho an-r Bsmwn- PELTERIB INVBNTOR July 29, 1924. 1,s0 ,9s4 R-ESNAULT-PELTERIE PERCUSSION PUMP Filed Oct. 22. 1923 5 Sheets-Sheet 5ROBERT ESNAULT- PELTERIE,

INVENTOR Patented July 29, 1924.

warren stares sezssa ROBERT ESNAUL T-PELTERIE, OF PARIS. FRANCE.

rnacnssron ruins.

Application filed October 22, 1923. Serial No. 669,932.

T 0 all whom it may concern:

Be it known that I, ROBERT ESNAULT- PELTERIE, a citizen of France, and aresident of Paris, France, have invented new and useful Improvements inPercussion Pumps, which is fully set forth in the followingspecification.

My invention relates to a percussion pump for liquids which is chieflyintended for the supply of fuel to internal combustion engines and moreparticularly for the supply of gasoline. In this type of pump, somedifiiculties are to be overcome, for on the one hand itis necessary toprovide for a very small cylinder full in a very regular manner in spiteof great variations of speed, (the term cylinder-full being hereinemployed to designate the volume of liquid discharged at each stroke ofthe pump although in fact the latter has neither piston nor cylinder),and on the other hand it is required to obviate all gripping, forinasmuch as the gasoline possesses anti-lubricating properties, nofriction (for instance between a cylinder and piston) can be allowed.within the liquid, while its great fluidity would make'it necessarytoprovide for a very close adjustment of the parts and the use of tightpacking.

In order to obviate these drawbacks, l dispense with the use of acylinder with piston as the operative element of the pump and employ apercussion device which is so disposed as to strike against a stationaryelement at each stroke of the pump, for in stance by the action of aspring.

The following description and appended drawings which are given by wayof example set forth the present invention.

Figs. 1 to 16 show various forms of the percussion element or strikerand its stoppiece.

Fig. 17 is a sectional View pump wherein the striker is the one shown inFig. 1.

Fig. 18 is a view one-half in section and one-half in elevation of apumpof this con struction mounted in vertical position within thebody ofthe liquid to be pumped.

Fig. 19 represents a modification of the control. I

- Fig. 20 represents another modification of the same.

Fig. 21 shews a special arrangement for use upon aviation enginesespecially for of theentire analogous to those using a carburettersubjected to extra pressure by means of a turbo-compressor.

Fig. 22 relates to 'a modification com-- prising an elongated conduit.

Fig. 23 shews a modification comprising a chamber serving to obtain aregular output.

Fig. 24 is a general View of an improved form of the pump.

Fig. 24 is a view on a larger scale of the central portion of Fig. 24with modifications.

Figs. 25, 26, 27, 28 are detail views of various constructional forms ofan element which is hereinafter termed difiuser.

Figs. 29 and 30 show two improved forms of the reaction spring used withthe ball or valve serving for the discharge.

The percussion element or striker a, Fig. 1, has a flat shape and is sodisposed that at each stroke of the pump it will strike against a fixedelement 7), for instance under the action of a spring. At the centre ofthe element b is formed the aperture 0 which is controlled by a ball orvalve d urged by a spring 6 in such manner that when the striker disc (4comes into contact with the surface I) the impact will not only expel aconsiderable part of the liquid outwardly of the striker but will alsooblige a certain part of the liquid to lift the valve or ball d, thelatter being then brought back upon its seat by the action ofthe spring6.

The other figures from 2 to 16 indicate other forms of the striker andof its seat; the. said ball or valve and spring shown in Figsfl and 2are not further illustrated, for the sake of simplicity.

In the constructional formof the apparatus shown in Fig.17, the valve dconsists of a ball, and the striker a mounted upon the. rod 7 isimpelled upon its seat by the spring 9 adapted to bear upon a nut withhemispherical boss 7L through the medium of the cap 2'; the other end ofthe said spring bears upon an adjustable end-piece At the end of the rodis mounted a fork is which is pivoted upon an axle Z disposed on the endof a rocker m pivoted on a stationary axle a and whose pointed end 0co-operates with a cam 79 which is rotated by the shaft q in thedirection of the arrow.

The gasoline is supplied from the fuel tank to the device through thetube 9 which should be suiiiciently large, and it enters the chamber 3.In order to prevent the liquid in the said chamber from entering thespace occupied by the spring 9 (should this prove necessary) a bronzenut t forming a stuliing box compresses the plastic substance M which isof variable nature according to the fluid to be delivered by the pump.For gasoline, it will be advantageous to employ for this purpose a massof tow impregnated with a paste consisting of a mixture of black softsoap (or a soap paste formed with water) and graphite, or preferablywith a paste consisting of castor oil and graphite.

The rod 7" which is guided in the bronze nut t should not be subject tofriction in the portion situated outwardly of the packing i. e. the partsituated in the gasoline, and for this reason all the figures indicate aconsiderable play between the rod and the end a of the stufling box.

The spring a of the ball or valve d can be more or less compressed bymeans of a screwthreaded rod 7) controlled by the handwheel to andtraversing a stuffing box 00 analogous to the preceding.

The said pump is operated in the following manner hen the shaft grotates in the direction of the arrow, the inclined part of the cam 79will lower the end 0 of the rocker m which by means of the axle Z willdraw upon the fork is, the rod f and the striker a, thus compressing thespring 9 In these conditions, the liquid will evidently occupy a largespace between the said striker and its seat 6.

lVhen the cam attains the position shown in Fig. 17, the end 0 of therocker becomes free and the said rocker, which is thus released, will beacted upon by the spring 9, and the latter, operating through the medium of the cap 2', the nut h and the rod 7, will impel the said strikerupon its seat Z) with great force.

The major part of the liquid situated between the striker and its seatwill thus be forced out into the chamber 8, but calculation andexperiment show that the impact produces a suflicient pressure at themiddle part of the liquid in order to expel a certain portion of theliquid into the aperture 0, so that the said liquid will raise the valve(Z and will enter the chamber y. After the said chamber is completelyfilled the liquid thus discharged will drive before it at each stroke acorresponding volume of liquid and the latter will issue through theconduit 2.

t is evident that, at each discharge stroke, the same speed will beimparted to the striker avby the said spring, and this irrespectively ofthe speed of rotation of the shaft 9, since the end 0 of the rocker aswell as the corresponding portion of the said cam are formed with asharp angle so as to provide for the abrupt dropping of the rocker.ln'these conditions the volume of liquid discharged at each strokethrough the valve 63 will be theoretically independent of the speed ofrotation of the cam shaft 9 and will depend solely upon the tension ofthe spring 9 and the total massmoved by the latter, and also upon thetension of the spring 0 of the valve d.

Experiments proved however that this condition of pendence cannot beobtained in all cases. For instance with the simple form shown in Fig.1, the cylinder-full will increase with the speed of the cam shaft, ayin the proportion of 2 to 1, between 0 and 4000 revolutions per minute.But the cylinder-full will remain constant between these speeds if useis made of a striker having the shapes analogous to those indicated inFigs. i and 17. v

Shapes analogous to that of Fig. 6 will obviously afford intermediateresults, i. e. an augmentation of the cylinder-full with increased speedof. the cam shaft, but to a less degree than with the flat striker.

A diminution of the cylinder-full for increasing speeds may be obtainedwith strikers as shown in Figs. 7, 8, 9, 10, 11, 12, provided thefilling ofthe space between striker and seat shall be hindered whenoperating at high speeds, and for this purpose the cylindrical partswhen at the end of the stroke are but little (or not) disengaged fromone another in the lateral direction; however a slight diametral playmust be allowed between these parts in order to prevent gripping.

Precautions must be taken in order that the chambers s or 3 shall notform acoustic resonators acting at certain speeds in accordance with thefrequency of the pump, and to this end the chamber 7 is preferablyfilled upwith balls which will give a complex form to this space so asto break up the elastic waves; the diameter of the balls can only bedetermined by experiment for each particular case. Balls may also beemployed in the space 8, provided the striker is surrounded byprojections 8 which prevent all contact with such balls, Fig. Suitablemetallic filling pieces of different shapes may also be employed inorder to render this space non-syminetrical, and Fig. 21 indicates afilling piece 7 which consists of an obliquely cut ring.

Should the said pump be used for the engines of motor vehicles forelevating the gasoline from the tank to the carburetting apparatus, itis preferable to employ the arrangement shewn in Fig. 18 wherein thepump is vertically disposed upon the bottom of the fuel tank itself; thereference letters in Fig. 18 correspond to those of F 1'7, and nofurther description will be necessary, except that by reason of thetotal immersion of the de ice in the gasoline, the bronze bearing 2? isherein disposed between two packing members a and a analogous to theabove described member at (Fig. 17) the whole being maintained by thenut In this manner, the hearing will always be supplied with castor oiland graphite.

It is observed inFig. 18 that the releasing mechanism has been stillfurther sim' plified; the rocker is eliminated and the nut h co operatesdirectly with the cam p mounted on the shaft g which is driven by theengine.

Some difliculty may be found in disposing the shaft '9 upon a motorvehicle, and for this reason it may be replaced by the arrangement shownin Fig. 19 wherein the end of the rocker m instead of being directlyactuated by the release device, is controlled by means of steel wire,piano cord or cable a attached to a rocker arm 6 whose end 0 forms apawl co-operating with a ratchet wheel or releasing cam d mounted uponany of the rotating parts of the engine, the number of teeth beingexaggerated in the figure for greater clearness. But in this form ofcontrol device, the wire or cable a is subjected to the same abruptmotion as the striker, itself, and this may be prejudicial to itsduration.

This drawback can be obviated by controlling the said wire or cable notby the ratchet teeth as in Fig. 19 but by a cam or link which imparts tothe wire an alternate motion without jerks. In order to provide for therelease action which is necessary for the operation of the pump, I may(Fig. 20) control by the wire or cable a and a fork p apertured at f, arod 2' which is slidable in a stationary portion 9 of the main frame ofthe pump and is provided at the other end with an axle 72 having pivotedthereto the arm (Z which is urged at the outer end by an obliquelydisposed spring 1. The arm d comprises a projection 72 co-operating witha like portion 0 of the rocker m and also a ramp 6 co-operating with theroller .9 mounted on the stationary axle F.

The operation of the said device is as follows:

In the position shown in Fig. 20, the said steel wire or cable and thepart which it controls are indicated by the full lines repre senting theupper position into which these parts are brought by the said spring. Asthe said wire or cable descends,-it draws with it the slidable rod i andalso the arm (Z which moves the end 0 of the rocker m hen the said rampcomes into contact with the said roller having afixed axle, the arm (Zwill be moved away from the said rocker in its rotation upon the axle h,and at a given moment the projection 19 will release the end of therocker 0 as shown in the broken lines, Fig. 20, thereby releasing therocker m and the striker connected therewith as shown in Fig. 17.. Thisconnection has been omitted in Fig. 20.

The whole of the sliding members may therefore descend as far as the endof the stroke under the action of the said wire whose movement is nowterminated, and upon returning to the upper position, the inclined rearpart of the projection 22 will gradually mount upon the inclined part ofthe end of the rocker 0 which has now resumed its position as shown inthe full lines, until these portions of the two projections becomedisengaged and the latter now assumes the position shown in Fig. 2.0, byreason of the inclined position of the spring; the parts are now inposition for the succeeding release movement, and so on.

Experiments proved that the said pump will operate even when thepressure in the chamber 8 becomes reduced to onetenth of an atmosphere,so that it is especially adapted for aeroplane use, for elevating fuelfrom the gasoline tank (which is at atmospheric pressure) to thecarburetting apparatus, and chiefly when the aeroplane is flyingat veryhigh altitudes and the carburetting apparatus is subjected to extrapressure by means of a turbo-compressor.

In these conditions, in order that the cylinder-full shall beindependent of the inlet pressure of the pump, it is preferable that thepressure required for lifting the discharge valve cZ should be asuniform as possible. But in the arrangement Fig. 17 if the pressure inthe chamber 3 is considered as constant, it is obvious that when thepressure is reduced in the chamber 8 the valve (Z will be urged upon itsseat not only by the spring 6 but also by the excess of pressure in thespace y compared to the pressure in the space 8.

To compensate this action, the spring 6, Fig. 21, acts no longer in adirect manner upon the valve d but through the medium of a rod 7 mountedupon a diaphragm g 4 analogous to the type employed in aneroidbarometers, and the atmospheric pressure will act upon the left handside of the diaphragm;

The cross-section of said diaphragm can be readily determined so thatthe excess of pressure in 3 over atmospheric pressure will diminish theaction of the spring 6 upon the valve d according as the action of thepressure is 8* upon the valve becomes reduced.

Adjustment of the cylinder-full can be eifected by modifying the tensionof the spring 9 or of the spring 6. For an increased tension of thespring 9 the cylinderfull will be greater, but an increased tension onthe spring 6 will cause a diminution of the cylinder full. w l g In thearrangement shown in Fig. 23, the spring 9 acts directly or through theme dium of a ball-joint upon the striker itself, and this will have theadvantage of reducresented in the vertical position so as to provide forthe escape of air-bubbles to the top. In the modification shown in Fig.24 (as I compared to Fig. 17) the spring 9 acting Ill) upon the strikera is now disposed within the full supply chamber .9, this arrangementserving to obviate the excessive stress upon the rod 7 due to the impactin the case in which the spring acts upon the said rod and not directlyupon the striker.

To allow the axle Z to describe an arc of a circle as determined by thearm of the rocker m, the portion f of said rod which is adjacent theaxle- Z is flattened so that this part will be more flexible.

During the impact, the rod 7 is to be freed not only from the effect ofthe inertia of the head of the spring but also from that of the saidrocker, so that the axle Z, Fig. 24:, instead of being disposed withinan aperture in the arm m of the rocker, is simply engaged at eitherendin corresponding notch in the arm, and hence during the in pact ofthe striker, the said rocker will continueto move in an independentmanner until its pointed end m drops upon the lower portion 22 of thesaid cam (or otherwise until any desired part of the rocker comesagainst a suitable stop-piece).

It is observed by experiment that in this position of the spring, whichis most advantageous as concerns the stresses upon the parts, a drawbackmay be incurred from the fact that the said spring might during itscompression produce an effort which is greater on one side than on theother whereby a torsional effect is produced upon the rod f at the pointof junction 2' with the head of the striker a, so that the latter wouldfall obliquely upon its seat 6.

To obviate any such unequal action. the spring is disposed. Fig. 2-l,between two Cardan joints 2 .2 each consisting of three rings, the twoouter rings each having two knife-edges in diametral position and inline with one another; the middle ring has in like manner two recessesin diametral position and in line with one another upon each face,co-operatitng with the said knifeedges, the recesses on each face of themiddle ring being disposed at right angles to those on the other face,in order to form a Cardan oint.

The portion of the conduit situated between the orifice c of the strikerseat 6 and the discharge valve d performs a very important part in theobtainment of regularity in the amount of liquid discharged at eachstroke irrespectively of the variablerotation of the shaft 9.

If for example this portion of the conduit should simply have the formof a long and narrow tube, it is found by experiment that by reason ofthe inertia of the column of liquid projected by the striker at eachimpact, the amount of liquid discharged at eachstroke will increase withthe operating speed.

Should .it be desired to maintain a constant value for this amount inspite of variations in speed, it will be advantageous to F enlarge thesaid conduit so. that it will form a chamber wherein may be disposedone: or more elements whose aggregate will be. termed diffuser.

Fhe said elements are intendedto. annul by a braking or damping actionthe effects of the inertia of the liquid, andthis result. can be.obtained by three different methods which may be approximately groupedin. three principal classes, or may be. employed in combination:

1. Damping of the liquid. properly so. called upon large surfaces.

2. The stream of liquid is broken up by one or more successive sharpangles.

The liquid is caused to flow at high speed through one or more orificesfollowed by enlarged spaces wherein the speed becomes reduced; should aplurality of orifices be employed, these may be disposed in series, withan enlargedspace between each.

a. Combinations or modifications. of. said. means.

The elementsor diffusers for damping the. liquid pertaining to. thefirst class as above. mentioned may have theform of a. simple, cylinder,preferably with a roughened.sur.- face, which is centered at each .end.by'means. of three small studs, Fig. 25, allowing, an small spacebetween the cylinden and theuio chamber in which it is mounted.

A very large friction surface may be ob tained by replacing the solidcylinder shewn in Fig. 25 by a coil of thin metallic strips which areeither smooth or have: a raised surface.

The diffusers of the second class may be. formed with baflies of asimple character, Fig. 26, or of battles disposed. upon an apertureddiametral partition, Fig. 27, orfur ther, of wire gauze in variousarrangements.

A diffuser of the third class may be formed as indicated in F ig. 2%.

In order to form the orifice c of the striker seat, a diaphragm 00 isemployed having a central aperture with sharp edges and the anglebetween the faces constitutin the sharp edge may be varied at willprovided a. sufliciently sharp edge is maintained.

The said diaphragm may be held in place 1 (Fig. 2 by a removable member.having the form of a ring 3 which is traversed mid way upon its heightand according to a diameter by a round pin a serving to break up thestream of fluid issuing from the diaphragm 00,- at the rear of the ringy and forwardly of the seat d? of the ball valve d may be disposed asecond diaphragm 03 resembling a: or difiering therefrom either by thediameter of the aperture or by the angle between the faces forming thesame. The whole device is maintained for instance by the seat d of thevalve (Z, which may have the form of a nut. Vith this arrangement thediaphragms 0e and x may be renewed or may be replaced by others whereindiflerent diameters of aperture or a different angular disposition ofthe faces forming the sharp edges may be employed, thus obtaining-a veryclose adjustment for each particular case.

It is obvious that one might eliminate the second diaphragm m or thefirst-mentioned diaphragm 00 (while retaining 90 as desired, and themost advantageous arrangement is to be determined by experiment for eachparticular case.

The number of combinations and varied arrangements of the means forobtaining a regular output will be thus considerable. As shewn in Fig.28, these may comprise for example a cylinder analogous to the one shewnin Fig. 25 disposed between two end caps or diaphragms separated fromthe flat ends of the cylinder by a very small space which is regulatedfor each particular case and which forms two throttling portions in thepath of the liquid, or the device may comprise a plurality of cylindersof the kind shewn in Fig. 28 which are disposed in series and separatedby a like number of caps or diaphragms, so as to augment the surfacefriction of the liquid as well as to increase the number of the breakingpoints for the stream, or in other cases, use may be made of a cylinderor of coiled strips disposed between two orifices formed in thin walls,or like dispositions can be adopted.

Obviously, the preceding description of the diffusers is in no wise of alimitative nature, but serves solely to indicate various forms ofconstruction.

I have made experiments with numerous forms of this device, but it willbe evidently impossible to enumerate the whole of these forms in detail,it being obvious that the invention comprises all devices which are'capable of damping the liquid stream (as above indicated) by. frictionor by the successive breaking up or throttling of the same. I a

In all the methods adopted for securing the regular output of the pumpirrespectivelv f t e variablespeed. of the cam shaft,

the best regulation can only be determined by experiment for eachparticular case.

An important improvement further consists in the arrangement of thespring 6 acting upon the ball d. Should the spring be too small itbecomes diflicult to manufacture it to a very exact size, so that it mayslip upon the ball and become jammed in its guide, and thus theoperation will be irregular.

For this reason, I have been led to replace the said spring by flatsprings with radial strips or tongues Figs. 29 and 30, these beingpunched out of thin sheet steel, and it is preferable that all thetongues should be made integral with a common ring-shaped portion is, sothat the whole aggregate can be held in a suitable support t=, Figs. 24and 246 the device being in concentric position so as to provide for anequal pressure of the ends of said tongues upon the ball (Z.

The proper vibrations of the said tongues shouldnot be allowedto affectthe said ball, and to this end it may be preferable to form the sheetmetal piece in such manner that the said tongues shall have unequallengths while at the same time maintaining the symmetrical arrangement,as shown in Fig. 30.

Lastly, experience has proved that it is preferable to limit the amountof lift of the said ball (Z, so that I have provided it (Fig. 24) withan adjustable stop-rod e which may be moved either way by screwing orunscrewing a milled head Q02, whilst the aggregate of the support icontaining the spring 6 and the stop-rod '0 can be displaced by themilled hand-wheel e0 Obviously, the above-mentioned arrangements are notof a limitative nature and are given solely by way of example, beingsusceptible of all necessary modifications without departing from theprinciple of the invention.

In particular, the arrangement may comprise a plurality of ball-valvesor like valves (Z disposed rearwardly of a corresponding number ofapertures 0, or otherwise a plurality of apertures c co-operating with acommon valve d; the said release device may also be modified, as well asthe control of the tension of the springs g and e.

What I claim is 1 1. A percussionpump comprising a pump body and astriker disposed therein a stationary member having a conduitformedtherein, the said striker being adapted to ary member having a conduitformed therein, means enabling the said striker to strike abruptlyagainst the said stationary member and to discharge the liquid abruptlycompressed between the striker and the stationary member into thesaidconduit.

3. A percussion pump comprising a pump body, a striker disposed therein,a stationary member having a conduit formed therein, and a quick releasedevice controlling the said striker whereby the same shall be impelledagainst the said stationary member.

4. A percussion pump comprising a pump body, a striker disposed therein,a stationary member having a conduit formed therein, a valve or balldisposed adjacent the said conduit and situated. on the opposite side ofsaid stationary member from the striker, andmeans impelling the saidstrikeragainst the said stationary member.

5. A percussion pump comprising a pump body, a striker disposed therein,a stationary member having a conduit formed therein, a spring urging thesaid striker against the said stationary member, a rod :secured to thestriker, a releasing element pivoted to the end of said rod, and meansfor controlling the said element in such manner that the striker shallbe separated from the stationary member while at the same timecompressing the said spring and shall be then abruptly brought back bysaid spring, thereby assuming a well-defined movement which isindependent of the speed of the device controlling the release.

6. A percussion pump comprising a pump body, a striker disposed therein,a stationary member having a conduit formed therein, a spring urging thesaid striker against the said stationary member, a quick release elementfor compressing the said spring and for subsequently releasing the saidstriker, a valve disposed adjacent the conduit of the stationary memberand situated on the opposite side of said member from the striker,spring urging the said valve against the outlet of the conduit, andmeans for regulating the tension of the striker spring and of the springcontrolling the said ball.

7 A percussion pump for fuel injection into the cylinder of an internalcombustion engine, comprising a pump body, a striker disposed therein, astationary member having an aperture, formed therein against which't-hesaid striker is impelled, ;means for actuating the said striker, meansfor fuel feed to the interior of the said ,pump body, and suitablepiping whereby the engine cylinder shall be supplied with the fuel whichis discharged by the said striker at each stroke,

8. A percussion pump for elevating liquid fuel from a supply tank andfor detwochambers, means causing the striker to strike against the saidpartition and todischarge the Qfiuid in the pump body through the "saidconduit, .a valve disposed adjacent the said conduit and situated in thesecond chamber of the pump, a spring urging the said valve against theoutlet of said conduit, means whereby the action of said striker and thetension upon the said ball can be regulated from the exterior, suitablepacking members and stutfing boxes disposed within the pump body.

10. A percussion pump comprising a pump body, a striker disposedtherein, a stationary partition having a conduit formed therein anddisposed within thepump body in such manner as to divide the same intotwo chambers, a spring disposed in immediate proximity to the head ofthe striker and adapted to impel the saidstriker against the saidpartition, a ball disposed adjacent the said conduit and situated withinthe second chamber, means urging the said ball against the outlet of thesaid conduit, and aquic'k release device "for compressing the strikerspring and subsequently releasing the said striker.

11. A percussion pump comprising a pump body, a striker disposedtherein, a stationary partition having a conduit formed therein anddisposed within the pump body in such manner as to divide the same intotwo chambers, a spring disposed in immediate proximity to the head ofthe striker and adapted to impel the said striker against the saidpartition, a Cardan device interposed between the end of the said springand the striker head, a like Cardan device interposed between the end ofthe spring and the wall of the pump body upon which it is caused tobear, whereby all lack of symmetry in the action of the spring shall be0bvi ated, a valve disposed adjacent the said con duit and situatedWithin the second chamber, means urging the said valve against theoutlet of the said conduit, and a quick release device for compressingthe striker spring and subsequently releasing the said trikr 12. Apercussion pump comprising a pump body, a striker disposed therein, astationary partition having a conduit formed therein cooperating withthe head of the striker, a valve disposed adjacent the said conduit of ithe stationary partition and situated on the opposite side of the latterfrom the said striker, means urging the said valve against the outlet ofthe said conduit, a spring adapted to impel the head of the said strikeragainst the said partition, a rod secured to the head of the striker, atransverse axle mounted at the end of the said rod, a double-armedrocker, an open slot or notch formed in one arm of the said rocker andco-operating with the said transverse axle, a cam controlling the otherarm of the said rocker and provided with an offset for the dropping ofthe said arm, and means for rotating the said cam.

13. A percussion pump comprising a pump body, a striker disposedtherein, a stationary partition having a conduit formed therein, meansfor impelling the head of the said striker against the said partition, aquick release device controlling the striker, a valve disposed adjacentthe said conduit and situated on the opposite side of the saidpartition, and means whereby the l quid stream which the striker tendstoproduce at each stroke shall be broken up within the conduit formed inthe stationary partition between the striker head and the said ball.

14. A percussion pump comprising a pump body, a striker disposedtherein, a stat onary partition having a conduit formed therein, meansfor impelling the head of the said striker against the said partition, aquick release device controlling the striker, a valve disposed adjacentthe outlet of said conduit and situated on the opposite side of the saidpartition, a member restricting the said conduit of the stationarypartition at a given point, a coaxial member disposed withinthe saidconduit, and a second member restricting the said conduit at anotherpoint, in order to break up the liquid streams which would tend to beformed within the said conduit, and a valve situated adjacent the outletof the said conduit.

15. A percussion pump comprising a pump body, a striker disposedtherein, a stationary partition having a conduit formed therein, anddisposed within the pump body, means for impelling the head of the saidstriker against the said partition, a quick release device controllingthe striker, a valve adapted to close the end of the said conduit on theside of the partition opposite the striker, an elastic member consistingof a cut-out metal disc forming radial tongues whose ends adjacent thecentre of the disc co-operate with the said valve or ball in order tourge the same against the outlet of the said conduit, means whereby theliquid stream which the striker tends to produce at each stroke shall bebroken up within the conduit formed in the stationary partition.

16. A percussion pump comprising a pump body, a striker disposedtherein, a stationary partition having a conduit formed therein anddisposed within the pump body, means for impelling the head of the saidstriker against the said partition, a quick release device controllingthe striker, a valve adapted to close the end of the said conduit on theside of the partition, opposite the striker, an elastic memberconsisting of a cut-out metal disc forming unequal radial tongues whoseends adjacent the centre of the disc co-operate with the said valve inorder to urge the same against the outlet of the said conduit, meanswhereby the liquid stream which the striker tends to produce at eachstroke shall be broken up within the conduit formed in the stationarypartition.

17. A percussion pump comprising a pump body, a striker disposedtherein, a stationary partition having a conduit formed therein anddisposed within the pump body, means for impelling the head of the saidstriker against the said partition, a quick release device controllingthe striker, a valve adapted to close the end of the said conduit on theside of the partition opposite the striker, an

elastic member consisting of a cut-out metal disc forming rad al tongueswhose ends adj acent the centre of the disc co-operate with the saidball in order to urge the same against the outlet of the said conduit,and an adjustable stop piece for limiting the amount of lift of the saidball, means whereby the liquid stream which the strike tends to produceat each stroke shall be broken up within the conduit formed in thestationary partition.

In testimony that I claim the foregoing as my invention, I have signedmy name hereto.

ROBERT ESNAULT-PELTERIE.

